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Custom Wheels 101: What are Wheel Backspacing and Offset?

The perfect set of wheels is an essential element of any classic car build, but choosing wheels isn't always as easy as it might seem. There are many technical variables that must be considered, including bolt pattern, diameter, width, backspacing, and offset. Once you've established the wheel specs you need, you'll have to shop for an appropriate set of wheels with an appealing design and finish. In this article, we'll provide some info and diagrams to help you answer the question "what are wheel backspacing and offset?"

GM Transmission Identification Guide: Chevrolet, Pontiac, Buick, & More

Have you ever wondered, "What transmission do I have?" As time marches on, technology changes. Classic car restoration is not a new hobby, and the older the project car, the more likely it is that someone has installed a different transmission at some point along the way. Modern 6-speeds are easy to spot, and 5-speeds are not difficult either, but when it comes to older 4-speeds and automatics, the increased variety can muddy the waters. So, whether you are heading out to check out a "For Sale" ad that could be your next project or trying to make heads or tails of a junkyard find, the following charts can be useful guides when it comes to GM transmission identification.